- Nbm Development LLC
- Ncr Corporation
- Ncr Parking Management LLC
- Near East Resources
- Near North Animal Hospital LTD
- Near The Pier Development Cntr
- Neat & Naked, LLC
- Nederlander National Markets, LLC
- Neiman Marcus
- Nela Navarrine
- Nelson Smith
- Neon And Light Museum
- Nepal House
- Nerdstogo Ntg10049
- Netsync Network Solutions INC
- New Age Nail Studio
- New Age Nail Studio
- New Age Technology Construction Company
- New City Halsted Pharmacy
- New Cleaners
- New Creation Coaching, LLC
- New Image Works
- New Life Design Tthomas Elias Lockhart Iii
- New Link Access Corp
- New Mark Twain, LLC
- New Music School
- New Sterling Cleaners
- New Zaiqa
- Newberry Library
- Newport Capital Partners
- Newsmark, INC.
- Next Level Consultants INC
- Next Level Valet Parking
- Nextech Energy Systems
- Nice Ice Chicago LLC
- Nicholas Clarke
- Nicholas Joseph Custom Tailors
- Nicole Genovese
- Nike Town
- Niki Lee Shipman LLC
- Nimble
- Nimbus-5 LLC
- Nina
- Nippon Steel North America, INC.
- Niu
- Nkfi
- No Cold Feet
- No Constraint Designs
- No Vacancy
- Nomad-chicago
- None
- None
- None
- Nonnina
- Nora Restaurant
- Nordic House
- Nordstrom Marketplace Cafe/habitant
- North Avenue Beach House
- North Loop Market
- North Shore Exchange NFP
- Northwestern University Bookstore #776
- Norvax, INC.
- Norvax, LLC
- Nosey I Corp
- Nosiboo USA INC
- Not So Perfect
- Novogroder Companies INC.
- Nrs Real Estate
- Nrs Rental Property
- Ns Sales, INC.
- Ntp Wireless
- Ntt Data INC.
- Nuhaus
- Nutritious Earth
- Nuventures 3000
- Nv Beauty Bar
- Nyc Bagel Deli - Dearborn
- O Spa
- O'brien Harris LLC
- O'briens Restaurant & Bar
- O'callaghan's
- O'dwyer Painting And Maintenance LLC
- O'leary's Public House
- Oak Street Tailors
- Obed Cleaning Services
- Obelix Restaurant
- Obesity Medicine Association
- Oc Condominium Developer LLC
- Ochi Consulting + Partners
- Octagon, INC.
- October's Very Own Merchandising Us, LP
- Odyssey Chicago River
- Off Color Brewing
- Off The Bolt
- Office Depot
- Officeluv
- Offshore
- Offshore Entertainment
- Ofs
- Oh Yes Chicago
- Ohio House Motel
- Ohio Parking
- Ohr Illumination
- Oil-dri Corporation Of America
- Okamura Corporation
- Oksispark LLC
- Old Author's Bbq
- Old Jerusalem Restaurant
- Old Navy Store #5328
- Old Town Ale House INC
- Old Town Animal Care Center
- Old Town Animal Care Center
- Old Town Athletic, INC (inc.)
- Old Town Barbershop Co.
- Old Town Fish Bar
- Old Town Garden INC.
- Old Town Medspa
- Old Town Nails Salon LTD
- Old Town Oil
- Old Town Pour House
- Old Town Pub
- Old Town Smokes And Kicks
- Old Town Valet Service
- Old Town Vintage
- Olio
- Olio E Piu
- Olive Mediterranean Grill
- Olive Mediterranean Grill
- Olivo Amigo
- Olly And Arya
- Olly Olly Group LLC DBA Tag
- Olson Communications, INC.
- Olympia Cleaners
- Omega Parking, INC
- Omni Chicago Hotel
- Omnicommunications
- On Experience 7 LLC
- On The Scene Chicago
- One 100 Chicago
- One Parking 707
- One Superior Place
- Onshore Technology Group, INC.
- Ontario Cleaners
- Ontario Place Valet Cleaners
- Openfaster
- Oppo Home Design, LLC
- Optimal Wellness LTD
- Optimus
- Orange Skin LLC
- Orange Theory Fitness
- Orangetheory Fitness
- Orangetheory Fitness
- Orca Supplychain INC.
- Order Of Friar Servants Of Mary, USA Province, INC.
- Organic Looms
- Ori Spa River North
- Ori Spa Streeterville
- Orizzonti
- Orleans Cleaners
- Orleans Nails And Spa LLC
- Orleans Plaza Newsstand
- Orso's Restaurant
- Oscar Isberian Rugs, INC.
- Oscar's Shoe Recrafting
- Osco Drug #3234
- Osewa Cleaners
- Oska
- Osteria Del Pastaio
- Osteria Via Stato
- Oud Coffee & Cafe
- Ouidie's Flair
- Ouray Technology Partners INC.
- Outside Magazine
- Overland Sheepskin Co., INC.
- Ow Lee Co INC
- Owlcrest
- Ox Bar & Hearth
- P O S H
- P.f. Chang's China Bistro, INC.
- P.f. Chang's To Go
- P&g Residential Services
- P3 Markets LLC
- Pac Leaders
- Pain Cave Fitness, LLC / DBA Magmile Crossfit
- Paks On The Pier
- Pallotta Tonic, LLC
- Pamela Nosse
- Panda Express #5046
- Pandora
- Pandora
- Panera Bread #9200
- Pangaea Information Tech
- Papa John's Pizza
- Paper Source
- Paper Source INC
- Papilon Press
- Paragon Global Initiative Foundation
- Paramount Cleaners
- Paramount Cleaners
- Parc Chestnut Cleaners